SUN HYDRAULICS
SCIALCV

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics SCIALCV (SCIALCV) is a direct-acting sequence valve with an integrated reverse flow check, designed to supply a secondary circuit with flow once the pressure at inlet port 1 surpasses the valve setting. This valve includes an integral check valve, enabling reverse flow from port 2 to port 1. It is designed for load holding applications and features interchangeable three-port sequence cartridges with identical flow paths and cavities for a given frame size. The valve requires that port 3, which serves as the drain, be connected to maintain pressure reference in the control chamber; blocking this port can lead to malfunction due to reciprocating seal weepage. The pressure at port 3 adds directly to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar). The SCIALCV is suitable for systems using phosphate ester fluids when configured with EPDM seals, but exposure to petroleum-based fluids will damage these seals. It incorporates Sun's floating style construction, minimizing internal parts binding due to excessive installation torque or machining variations. Key specifications include a maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, maximum valve leakage at reseat of 10 drops/min (0.7 cc/min), and check cracking pressure of 25 psi (1.7 bar). The adjustment mechanism allows for five clockwise turns to increase settings, and it has specific torque requirements for installation and locknut adjustments. The model weighs approximately 3.10 lb (1.40 kg) and has a capacity of up to 120 gpm (480 L/min).